Side-fired burner for heaters

ABSTRACT

A side fired heater assembly wherein multiple fuel burners are designed for side installation and operation with respect to the heater assembly, the burner firing guns being easily and quickly removable from the side of the assembly and wherein an air induction register for providing combustion air for said burners is completely operable from the side of the assembly. Further, the heater assembly is provided with an interior wall which is constructed from a refractory material for heat radiation wherein the plurality of side fired burners are positioned with respect to said refractory wall to provide heat for subsequent radiation by said wall.

' United States Patent Iverson Oct. 28, 1975 SIDE-FIRED BURNER FORHEATERS Primary Examiner-Edward G. Favors [75] Inventor: Donald J.Iverson, Tulsa, Okla. 73] Assignee: John Zink Company, Tulsa, Okla. [57]ABSTRACT A side fired heater assembly wherein multiple fuel 22 F d. 1Aug 27 1974 burners are designed for side installation and operal l PP500,841 tion with respect to the heater assembly, the burner firing gunsbeing easily and quickly removable from 52 us. C1 431/189; 431/186 9 0fthe a.sS?mb1y and i [51] I 2 reglster for providing combustion air forsaid burners nt. Cl. F23C 5/06 is completely Operable from the Side ofthe assembly [58] Field of Search 431/180, 188, 189, 186 Further theheater assembly is provided with an inte rior wall which is constructedfrom a refractory mate- [56] References C'ted rial for heat radiationwherein the plurality of side UNITED STATES PATENTS fired burners arepositioned with respect to said re- 2,091,487 8/1937 Peoples 431/189fractory wall to provide heat for subsequent radiation 2,499,556 3/1950Zink 431/189 x by said Wan 2,512,319 6/1950 Ferguson 431/189 7 Claims, 5Drawing Figures US. Patent Oct. 28, 1975 Sheet 1 of3 3,915,621

Fig.2

US. Patent Oct. 28, 1975 Sheet 2 of3 3,915,621

m St N: 02

Eu mm U.S. Patent Oct. 28, 1975 Sheet3 0f3 3,915,621

h at

mm A $9 A l A 4 a NN SIDE-FIRED BURNER FOR HEATERS BACKGROUND OF THEINVENTION 1. Field of the Invention This invention relates to heaterassemblies utilizing multi-fuel burners and more particularly, but notby way of limitation, to a side fired burner for heaters, heatexchangers and the like wherein the burner elements may be maintainedand operated from the side of the heater assembly rather than from thebottom.

2. Description of the Prior Art Heretofore, in the manufacture ofburners for heat exchangers heater assemblies and the like, andparticularly, multiple fuel burners, the burners were designed formounting directly to the bottom of the heater assembly. This design wasthe most expeditious since the flame was to be directed upwardly and thestate of the art for such multiple fuel burners was not advanced at thattime.

The patent to Zink, Jr., et al. US. Pat. No. 2,851,093, issued Sept. 9,1958, and entitled MULTI- PLE FUEL BURNER is representative of thetypical bottom installation of such burners whereby the central nozzle48 sprays a conical pattern of liquid'fuel upwardly into and through acylindrical shroud member 41 for burning within the cylindrical chamberof refractory material 12. This design permitted air to be introduced bythe register at 43 around the central fuel nozzle 48 and provided forthe removal and replacement of the nozzle 48 and gun assembly 47straight downwardly from the support cylinders 46. Other maintenance andadjustment also had to be accomplished from beneath the heater assemblynecessitating the mounting of said assembly above the ground forproviding a space for operation and maintenance thereof. Theaforementioned Zink et al. burner represented a major improvement of theart by creating high burn capacity in a small amount of space due toparticular arrangement of the nozzles with respect to the speciallyconstructed shroud and refractory member. Auxiliary gas tips 51 werealso installed from beneath'the assembly and were provided with separateair induction registers.

Further, the hot environment, the dripping of oil and the like mademaintenance very unpleasant, difficult and presented a high chance ofinjury to the worker.

It became apparent through customer feedback and increased safetyrequirements that it would be necessary to devise a burner andburnerassembly which would perfomi with the efficiency of the prior artburners but substantially eliminate the necessity to maintain andoperate said burners from the underside of the heater assembly. Thispresented a distinct problem due to the critical shape and relationshipof the shroud member, the refractory member and nozzle.

SUMMARY OF THE INVENTION.

The present invention provides a side fired burner for use in a heaterassembly which maintains the high degree of efficiency of the prior artburners and which permits removal of the working parts, maintenance andoperation of the burner from the side of the heater assembly rather thanfrom the bottom.

In order to prevent any drastic modification of the fuel gun which was aproven item, the nozzle of the fuel gun is provided with ports directedupwardly in a fanned shaped pattern as opposed to the conical shapepattern heretofore described. It has been found desirable that theshroud member shape correspond with the pattern of the fuel. The shroudmember of the present invention is provided with a rectangular crosssectional shape conforming to the fan shape spray pattern of the fuelgun nozzle.

Since the shroud member is oriented in the vertical position and the gunnozzle is inserted horizontally, it is necessary that the nozzle bepositioned accurately with respect to the shroud. A nozzle positioningmeans is provided adjacent to the shroud to properly position the nozzleupon installation of the fuel gun.

A single air register means is disposed beneath the burner for providingair supply both around the nozzle and the auxiliary gas tips, withremote control of the register being provided at the side of the heaterassembly.

A plurality of the side fired burners may thus be installed in a heaterassembly, each burner being disposed adjacent to a refractory heatradiation wall to provide the necessary heat requirements for the heaterassembly.

Further, the new nozzle design and associated shroud provide thecapability of substantially completely burning the fuel which can be alow grade fuel oil mixed with steam for smokeless burning.

DESCRIPTION OF THE DRAWINGS Other and further advantageous features ofthe present invention will more fully appear in connection with adetailed description of the drawings in which:

FIG. 1 is an end elevational view of a heater assembly employing aplurality of burners and a burner arrange ment embodying the presentinvention.

FIG. 2 is a side elevational view of the heater assembly of FIG. 1.

FIG. 3 is an elevational sectional view of a burner embodying thepresent invention;

FIG. 4 is an elevational view of the installation and control panel overthe burner of FIG. 3.

FIG. 5 is a top sectional view of the burner taken along the brokenlines 55 of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings indetail, reference character 10 generally indicates a heater assemblyemploying side fired burners l2 embodying the present invention.

The heater assembly 10 generally comprises a housing having verticallydisposed side walls 14 being closed by end walls 16 and being providedwith a floor member 18. The upper end of the heater assembly is providedwith a roof member 20 which is attached to the upper end of the sidewalls 14 and end walls 16, the upper end of the roof member 20 beingprovided with a suitable exhaust stack 22.

The heater assembly 10 is also normally provided with a heat exchangetube or the like 24 extending through the heater assembly in any wellknown manner. This heat exchanger may be of the plate type, tube type,as shown, or may be provided with any desired configuration or patternconforming to the interior of the heater assembly 10. The heaterassembly 10 naturally may be configured to be cylindrical, rectangularas shown in FIGS. 1 and 2, or any other convenient configuration havingsubstantially vertical side walls.

The interior surface of the side walls 14 of the heater are providedwith walls 26 which are made of a refractory material for efficientlyradiating heat applied thereto by means of the side fired burners 12.

Referring to FIG. 3, reference character 28 depicts insulation packingwhich is provided between the refractory walls 26 and the interiorsurface of the heater side wall 14. Further, the heater assembly floormember 18 is provided with an interior floor 30 which is made of firebricks or the like and is spaced from the floor member 18.

The burner assembly 12 generally comprises a fire wall member 32 havinga vertical disposed opening 34 therethrough. said opening 34 being ofrectangular cross sectional shape. The lower end of the fire wall 32sits directly on the heater floor member 18 and is in direct alignmentwith a rectangular opening 36 provided in said heater floor 18. Theinterior opening 34 of the fire wall 32 is provided with an inwardlyextending flanged shoulder member 38 which extends around the innersurface 34 of said firewall 32. The shoulder 38 on one side of the firewall 32 is provided with a pair of spaced openings 41 and 43 therein fora purpose that will be hereinafter set forth.

The burner 12 also comprises a burner housing having an open toptherein, said burner housing 40 being attached directly to the bottomsurface of the floor 18 of the heater assembly surrounding the opening36 therein. The housing 40 also comprises an outer housing wall 42 whichis secured substantially directly below the sidewall 14 of the heaterassembly 10. The burner housing 40 also comprises a bottom plate member44 which is provided with a plurality of spaced aligned apertures 46therein for a purpose that will be hereinafter set forth.

Avertically disposed rectangular shaped shroud support member 48 issecured within the burner housing 40 directly below the opening 36 inthe heater assembly floor 18. The support member 48 is secured to thebottom plate 44 of the burner housing and the side plates [not shown]thereof. The support member 48 is also provided with a horizontallydisposed intermediate cross plate 52 having an opening 54 therein. Avertically disposed stop plate 56 is also secured to the support member48 adjacent the opening 54, the plane of said plate being substantiallyparallel to the burner housing wall 42 and is provided with an opening58 therein for a purpose that will be hereinafter set forth.

Multi-fuel burner 12 further comprises a shroud member 60 having arectangular shaped vertically disposed opening 62 therethrough, saidshroud member 62 being mounted within the shroud support member 48, thebottom end thereof resting directly on the cross plate 52. The opening62 of the shroud member 60 is in substantial alignment with the opening54 in the said cross plate 52. The upper end of the shroud member 60extends into the opening 34 of the refractory member 32 adjacent theshoulder 38.

The outside burner housing wall 42 is provided with a substantiallycentrally disposed circular opening 64 therethrough. A cylindricalsleeve member 66 is secured to the outer surface of the wall 42 with theopening of said sleeve member 66 being in alignment with the opening 64in wall 42. The sleeve 66 is provided with a plurality of radiallyspaced set screws 68 around the outer periphery thereof. An elongatedhorizontally disposed cylindrical guide tube 70 is slidably disposedthrough the sleeve member 66, the opening 64 and a separate opening 68provided in the shroud support member 48 adjacent to the bottom of theshroud member 60. This guide tube 70 is supported entirely by the sleeve66 and associated set screws 68. The opening 72 in the shroud supportmember 48 is larger than the guide tube 70 thereby providing an annularspace therebetween for a purpose that will be hereinafter set forth.

An elongated multi-fuel or liquid fuel gun generally indicated byreference character 74 is slidably disposed within the guide tube 70,said gun having a nozzle member 76 on one end thereof which when fullyinserted through the guide tube is positioned directly below and inalignment with the opening 62 in the shroud member 60.

The gun assembly 74 generally comprises an oil and steam receiver member78 which is secured directly to the outer end of the guidance tube 70.The receiver member 78 is provided with a pair of oppositely disposedoil and steam inlet ports 80 and 82, respectively. The oil and steamreceiver member is also provided with a U-shaped pivotally mountedtightening yoke 84 with a tightening set screw 86 provided in the outerend thereof for a purpose that will be hereinafter set forth.

The removable gun 74 comprises an elongated gun tube 88 having anelongated centrally disposed oil passageway 90 therein, said oilpassageway 90 being surrounded by a steam passageway 92. The outer endof the gun tube 88 is provided with a manifold member 94 securedthereto, said manifold 94 having an oil passageway 96 and a steampassageway 98 provided therein. one end of each said passageway beingconnected to the oil and steam inlet ports 80 and 82, respectively. Theoil passageway 96 in effect connects the oil inlet port 80 with theelongated oil passageway 90 in the gun tube. Likewise the steampassageway 98 connects the steam inlet port 82 with the steam passageway92 of the elongated gun tube. V

The opposite end of the gun tube 88 is provided with the nozzle member76 as hereinbefore set forth. The steam passageway 92 is connected withthe oil passageway 90 adjacent the nozzle 76 to provide a mixture ofsteam and oil within one central nozzle chamber 100. The nozzle 76 issubstantially cylindrical in shape and is provided with a pluralityradially extending nozzle apertures 102 around the upper portionthereof. The outer end of the nozzle 76 is closed and tapers to asubstantial conical shape point 104. It is noted that the opening 58 inthe stop plate 56 is sized to receive the point 54 of the nozzle 76thereby accurately positioning said nozzle 76 with respect to thevertical opening 62 of the shroud member 60.

The outer wall 42 of the heater housing 40 is provided with a pair ofspaced vertically disposed elongated slot or enlarged openings 106 and108 therein. Each of the openings 106 and 108 is covered by an elongatedremovable plate member 110 and 112, respectively, said plates being heldin position by a plurality of screw members 114. The plates 110 and 112are each provided with circular openings 116 and 118 respectively for apurpose that will be hereinafter set forth. A pair of substantiallyL-shaped gas tubes 120 and 122 and disposed within the burner housing40, the horizontal portion of the tubes 120 and 122 extending throughthe openings 116 and 1 18 of the plates 110 and 112, respectively. Thevertical portion of the tubes 120 and 122 extend upwardly through theopening 36 in the heater floor 18 and in alignment with the openings 41and 43 in the firewall shoulder 38. The upper ends of the gas tubes 120and 122 are provided with gas nozzle tips 124 and 126 respectively.

It is noted that the gas nozzle tips 124 and 126, the upper end of theshroud member and the firewall shoulder 38 lie in a substantiallyhorizontal plane.

An airregister housing 128 is secured to the bottom plate 44 of theburner housing 40 and the interior surface thereof is coated withinsulation 130. A space 132 is provided within the air register housing128 between the insulation 130 and the bottom plate 44 of the burnerhousing. This opening 132 is in open communication with the plurality ofspacedaligned apertures 46 in the said bottom plate 44. The open space132 is provided with an elongated opening 134 beneath the heaterassembly 18 and at the opposite end of the space 132 from that of theapertures 46.

A vertically disposed lighting tube 138 is secured to the bottom plate44 of the burner housing 40 and extends downwardly through the registerhousing 128 and is provided with a closing cap 140 thereon. The closingcap 140 is provided with an oil drain hole 142. The tube 138 is disposeddirectly below the nozzle 76 for the purpose of initially lighting theburner.

A movable air register plate 144 is slidably disposed on the top surfaceof the bottom plate 44 and is provided with a plurality of spacedapertures 146 therein which correspond to the apertures 46 in the bottomplate 44. One edge of the slidable plate 144 is provided with a toothedrack 148. A pinion gear 150 is rotatably secured to the outside wall 42of the burner housing 40 by means of an operator rod 152 with adjustmenthandle 154 secured to the outer end thereof.

A cylindrical sighting'tube 156 is secured to the outer wall 42 of theburner housing 40 and is provided with a bore therethrough, said borebeing in alignment with the interior 34 of one side of the firewall orrefractory member 32 for a purpose that will be hereinafter set forth.

In operation, the gas tubes 120 and 122 may be installed into placeshown in FIG. 3 through the elongated or enlargedopenings 106 and 108 inthe outside wall 42 of the burner housing 40. Once the burner tips 124and 126 are in place adjacent to the shoulder 38, the supporting plates110 and 112 are secured into place as shown in FIG. 4 and tightened bymeans of the screws 114. The outer end of the gas tubes 122 are thenconnected to a gas supply line [not shown]. The gun assembly 74 is theninstalled into place within the guidance tube with the nozzle 76 of saidgun being forced into contact within the stop means aperture 58 of thestopping plate 56. The oil and steam inlet ports and 82 of the oil andsteam receiver 78 are then attached to oil and steam lines [not shown].The oil and steam manifold 94 is then disposed in contact with thereceiver member 78 in order to properly connect the oil and steammanifold passageways 96 and 98 to the elongated gun tube 88. TheU-shaped locking yoke 84 is then pulled over the manifold 94 andtightened into place by means of the set screw 86.

The cap is then removed from the lighting tube 138 and a flame source isprovided through the said tube 138 in and around the nozzle. acombination of steam and oil is then forced through the nozzle 76 andout the nozzle apertures 102. The steam will serve to break up the oilparticles and suspend said oil particles in the air to enhancecombustion thereof. The air register may then be adjusted by means ofthe rack and pinion 148 and to provide air in and around the nozzlemember 76 to support combustion of the oil and steam mixture emittedtherefrom. This air is introduced through the opening 72 in the shroudsupport member 48 around the guide tube 70.. After ignition of the oiland steam mixture in and above the shroud member 60, gas may be appliedthrough the gas tubes 120 and 122 thereby causing ignition thereof. Itis further readily seen that air introduced through the air registerapertures 46 also surrounds the shroud member 60 and provides furtherair to support combustion within the firewall opening 34 of the firewall32. Shoulders 38 within the opening 34 create a swirling effect therebyproviding for more complete combustion of the oil and gas mixturestherein and which reduces exhaust smoke and pollution. The fan shapedflames 161 from the burner will then be established adjacent to therefractory sidewalls 26 of the heater assembly thereby heating the saidsidewalls to a point whereby heat is radiated therefrom toward andagainst the heat exchanger 24. It is further noted that air introducedthrough the air register passes through the space 132, the register 46,the space 72 and around the nozzle 76.

When it is necessary to remove or perform maintainance on the oil andsteam gun 74 or the gas tubes 120 and 122, they can be removed andmaintained or replaced in a reverse manner to. that described forinstalling same. The sighting tube 156 is used throughout the operationto visually or electronically monitor the interior of the firewall 34 toinsure the presence of a flame.

From the foregoing it is apparent that the present invention provides aside fired burner for use with heater assemblies whereby the burner canbe substantially maintained and operated from. the side of the heater assembly as opposed to the requirement for operating the same from thebottom. 1

Whereas, the present invention has been described in particular relationto the drawings attached hereto, it isobvious that other and furthermodifications, apart from those shown or suggested herein, may be madewithin the spirit and scope of this invention. For example, referringback to FIG. 1, a second set of burners 160 may be installed well abovethe burners 12 to provide further heating capabilities within theheater. In the burner 160, however, the air register opening 132 What isclaimed is:

1. A side-fired heater assembly comprising a housing having a bottomfloor member, outside wall therearound, exhaust means secured to theupper portion thereof, said outside walls being lined with an insidewall of refractory material, :at least one liquid fuel burner secured toan opening provided in the floor member adjacent the outside wall andextending through said floor member to the interior of the housing, eachsaid burner comprising nozzle means extending horizontally below thefloor member to an area directly below the floor opening for directingfuel under pressure therethrough to produce flame, means for directingthe flame upwardly adjacent the interior surface of the inside wall,which comprises a refractory member interior of the housing adjacent theinside wall and secured to the floor surrounding the opening of theburner 160at the area designated by 162.

therein, said refractory member having a vertically disposed openingtherethrough, said opening having a rectangular cross sectional shape, aplurality of spaced inwardly extending shoulder segments surrounding thelower inside surface of the refractory member, a vertically disposedshroud member of rectangular crosssectional shape centrally disposed inthe floor opening, the upper end thereof being in substantial alignmentwith the shoulder segments 'of the refractory member, the outsidecircumference of the shroud member being less than the insidecircumference of the shoulder segments thereby providing a passagewaytherebetween, the lower end of the shroud member extending below thefloor opening, air register disposed below the means for directing theflame for introducing air therethrough. control means exterior of theoutside wall and operably connected to the air register for controllingthe volume of air admitted therethrough, means for removal of the nozzlemeans horizontally from the outside wall of the housing.

2. A side fired heater as set forth in claim 1 wherein the nozzle meanscomprises at least one horizontally disposed gas inlet line extendingbelow the floor member, an upwardly extending vertical section securedto the inner end thereof, a gas tip secured to the upper end of thevertical section and disposed in each space between adjacent shouldersegments of the refractory member, and a horizontally disposed liquidfuel gun extending below the heater floor to a point directly below theshroud member, a liquid fuel nozzle secured to the end of the gun andbeing disposed directly below the opening in the shroud member, saidnozzle having spray means for spraying liquid fuel upwardly through theshroud member into the refractory member in a pattern generallyconforming to the rectangular cross sectional shape of the shroud memberand refractory member.

3. A side fired heater as set forth in claim 2, and including meanscarried by the burner and cooperating with the liquid fuel nozzle forpositioning said liquid fuel nozzle with respect to the shroud member.

4. A side fired heater as set forth in claim 2 wherein the burner isenclosed within a burner housing secured to the floor of the heaterhousing, the upper end of said burner housing being open and surroundingthe opening in the heater housing floor, said burner housing having astationary bottom plate disposed below the nozzle means, and whereinsaid air register comprises a plurality of spaced openings in saidstationary bottom plate, a second movable plate having a similar set ofopenings therein horizontally movably secured to the stationary bottomplate, the openings in said movable plate being adjustable with respectto the openings in said stationary plate and wherein said control meansis for moving the movable plate with respect to the stationary plate.

5. A side fired heater as set forth in claim 4 wherein the control meanscomprises an elongated toothed rack secured to the movable plate, apinion gear rotatably secured to the burner housing and in meshingengagement with the tooth rack, and operator means exterior of saidburner housing for rotating the pinion gear.

6. A side fired heater as set forth in claim 4 wherein the means forremoval of the nozzle means comprises a large slot in the burner housingadjacent to the outside wall thereof for each gas inlet line wherebyeach said gas inlet line with associated vertical section and gas tipmay be removed through said slot and wherein a horizontally disposedguidance sleeve is secured to the side of the burner housing, the innerend thereof terminating adjacent to the bottom of the shroud member forreciprocally receiving the liquid fuel gun therein.

7. A side fired burner comprising:

1. a closed burner housing having an opening at the upper end thereof;

2. a refractory member attached to the top of said housing and having anopening therein in communication with the opening in the said housing,inwardly extending shoulder means secured around the inside periphery ofsaid refractory member;

3. shroud member extending through said housing opening, the upper endthereof being in substantially horizontal alignment with the shouldermeans and the lower end thereof extending into the burner housing;

4. gas nozzle means provided between the refractory member and theshroud member, gas nozzle tip secured to one end of the gas nozzlemeans, said tip being disposed in substantial horizontal alignment withthe shoulder means, opposite end of gas nozzle means extending throughone side of burner housing;

5. liquid fuel nozzle means horizontally extending through said housing,fuel nozzle secured to one end thereof and disposed directly beneath theopening in the shroud member, said liquid fuel nozzle having aperturesin the upper portion thereof for directing liquid fuel upwardly throughthe shroud member into the refractory member;

6. air register means carried by the burner housing for introducing airfor combustion into the shroud member and the refractory member.

1. A side-fired heater assembly comprising a housing having a bottomfloor member, outside wall therearound, exhaust means secured to theupper portion thereof, said outside walls being lined with an insidewall of refractory material, at least one liquid fuel burner secured toan opening provided in the floor member adjacent the outside wall andextending through said floor member to the interior of the housing, eachsaid burner comprising nozzle means extending horizontally below thefloor member to an area directly below the floor opening for directingfuel under pressure therethrough to produce flame, means for directingthe flame upwardly adjacent the interior surface of the inside wall,which comprises a refractory member interior of the housing adjacent theinside wall and secured to the floor surrounding the opening therein,said refractory member having a vertically disposed openingtherethrough, said opening having a rectangular cross sectional shape, aplurality of spaced inwardly extending shoulder segments surrounding thelower inside surface of the refractory member, a vertically disposedshroud member of rectangular cross-sectional shape centrally disposed inthe floor opening, the upper end thereof being in substantial alignmentwith the shoulder segments of the refractory member, the outsidecircumference of the shroud member being less than the insidecircumference of the shoulder segments thereby providing a passagewaytherebetween, the lower end of the shroud member extending below thefloor opening, air register disposed below the means for directing theflame for introducing air therethrough, control means exterior of theoutside wall and operably connected to the air register for controllingthe volume of air admitted therethrough, means for removal of the nozzlemeans horizontally from the outside wall of the housing.
 2. A side firedheater as set forth in claim 1 wherein the nozzle means comprises atleast one horizontally disposed gas inlet line extending below the floormember, an upwardly extending vertical section secured to the inner endthereof, a gas tip secured to the upper end of the vertical section anddisposed in each space between adjacent shoulder segments of therefractory member, and a horizontally disposed liquid fuel gun extendingbelow the heater floor to a point directly below the shroud member, aliquid fuel nozzle secured to the end of the gun and being disposeddirectly below the opening in the shroud member, said nozzle havingspray means for spraying liquid fuel upwardly through the shroud memberinto the refractory member in a pattern generally conforming to therectangular cross sectional shape of the shroud member and refractorymember.
 2. a refractory member attached to the top of said housing andhaving an opening therein in communication with the opening in the saidhousing, inwardly extending shoulder means secured around the insideperiphery of said refractory member;
 3. A side fired heater as set forthin claim 2, and including means carried by the burner and cooperatingwith the liquid fuel nozzle for positioning said liquid fuel nozzle withrespect to the shroud member.
 3. shroud member extending through saidhousing opening, the upper end thereof being in substantially horizontalalignment with the shoulder means and the lower end thereof extendinginto the burner housing;
 4. A side fired heater as set forth in claim 2wherein the burner is enclosed within a burner housing secured to thefloor of the heater housing, the upper end of said burner housing beingopen and surrounding the opening in the heater housing floor, saidburner housing having a stationary bottom plate disposed below thenozzle means, and wherein said air register comprises a plurality ofspaced openings in said stationary bottom plate, a second movable platehaving a similar set of openings therein horizontally movably secured tothe stationary bottom plate, the openings in said movable plate beingadjustable with respect to the openings in said stationary plate andwherein said control means is for moving the movable plate with respectto the stationary plate.
 4. gas nozzle means provided between therefractory member and the shroud member, gas nozzle tip secured to oneend of the gas nozzle means, said tip being disposed in substantialhorizontal alignment with the shoulder means, opposite end of gas nozzlemeans extending through one side of burner housing;
 5. liquid fuelnozzle means horizontally extending through said housing, fuel nozzlesecured to one end thereof and disposed directly beneath the opening inthe shroud member, said liquid fuel nozzle having apertures in the upperportion thereof for directing liquid fuel upwardly through the shroudmember into the refractory member;
 5. A side fired heater as set forthin claim 4 wherein the control means comprises an elongated toothed racksecured to the movable plate, a pinion gear rotatably secured to theburner housing and in meshing engagement with the tooth rack, andoperator means exterior of said burner housing for rotating the piniongear.
 6. air register means carried by the burner housing forintroducing air for combustion into the shroud member and the refractorymember.
 6. A side fired heater as set forth in claim 4 wherein the meansfor removal of the nozzle means comprises a large slot in the burnerhousing adjacent to the outside wall thereof for each gas inlet linewhereby each said gas inlet line with associated vertical section andgas tip may be removed through said slot and wherein a horizontallydisposed guidance sleeve is secured to the side of the burner housing,the inner end thereof terminating adjacent to the bottom of the shroudmember for reciprocally receiving the liquid fuel gun therein.
 7. A sidefired burner comprising: